GRB161004_125829_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20161004_175751465_000000_34893901     0 star  filter C [17777.6s - 17957.6s] expo=180s elev=39.5deg humid= 76% sunelev=-9.5deg (moon at  34.0deg phase=0.23 elev=+10.0 )
AL_20161004_180102758_000000_34893901     0 star  filter C [17968.8s - 18148.8s] expo=180s elev=39.1deg humid= 77% sunelev=-10.1deg (moon at  34.0deg phase=0.23 elev=+10.0 )
AL_20161004_180413680_000000_34893901    26 stars filter C [18159.8s - 18339.8s] expo=180s elev=38.8deg humid= 78% sunelev=-10.6deg (moon at  34.0deg phase=0.23 elev= +9.0 )
AL_20161004_182212094_000000_34894001    53 stars filter C [19238.2s - 19418.2s] expo=180s elev=36.7deg humid= 81% sunelev=-13.9deg (moon at  34.0deg phase=0.23 elev= +7.0 )
AL_20161004_182523563_000000_34894001    61 stars filter C [19429.6s - 19609.6s] expo=180s elev=36.3deg humid= 82% sunelev=-14.4deg (moon at  34.0deg phase=0.23 elev= +6.0 )
AL_20161004_182834313_000000_34894001    43 stars filter C [19620.4s - 19800.4s] expo=180s elev=35.9deg humid= 82% sunelev=-15.0deg (moon at  34.0deg phase=0.23 elev= +6.0 )
AL_20161004_184650973_000000_34894101    57 stars filter C [20717.1s - 20897.1s] expo=180s elev=33.5deg humid= 81% sunelev=-18.3deg (moon at  34.0deg phase=0.23 elev= +3.0 )
AL_20161004_185002161_000000_34894101    54 stars filter C [20908.3s - 21088.3s] expo=180s elev=33.1deg humid= 80% sunelev=-18.8deg (moon at  34.0deg phase=0.23 elev= +2.0 )
AL_20161004_185312933_000000_34894101    43 stars filter C [21099.0s - 21279.0s] expo=180s elev=32.7deg humid= 80% sunelev=-19.4deg (moon at  34.0deg phase=0.23 elev= +2.0 )
AL_20161004_191106739_000000_34894201    49 stars filter C [22172.8s - 22352.8s] expo=180s elev=30.1deg humid= 80% sunelev=-22.5deg (moon at  34.0deg phase=0.23 elev= +0.0 )
AL_20161004_191417514_000000_34894201    52 stars filter C [22363.6s - 22543.6s] expo=180s elev=29.6deg humid= 80% sunelev=-23.1deg (moon at  34.0deg phase=0.23 elev= -1.0 )
AL_20161004_191729170_000000_34894201    43 stars filter C [22555.3s - 22735.3s] expo=180s elev=29.1deg humid= 80% sunelev=-23.6deg (moon at  34.0deg phase=0.23 elev= -1.0 )
AL_20161004_193536292_000000_34894301    47 stars filter C [23642.4s - 23822.4s] expo=180s elev=26.4deg humid= 81% sunelev=-26.7deg (moon at  33.0deg phase=0.23 elev= -4.0 )
AL_20161004_193847901_000000_34894301    45 stars filter C [23834.1s - 24014.1s] expo=180s elev=25.9deg humid= 81% sunelev=-27.3deg (moon at  33.0deg phase=0.23 elev= -5.0 )
AL_20161004_194159417_000000_34894301    47 stars filter C [24025.5s - 24205.5s] expo=180s elev=25.4deg humid= 82% sunelev=-27.8deg (moon at  33.0deg phase=0.23 elev= -5.0 )
AL_20161004_200011921_000000_34894401    44 stars filter C [25118.1s - 25298.1s] expo=180s elev=22.4deg humid= 80% sunelev=-30.8deg (moon at  33.0deg phase=0.23 elev= -9.0 )
AL_20161004_200323163_000000_34894401    33 stars filter C [25309.3s - 25489.3s] expo=180s elev=21.9deg humid= 80% sunelev=-31.3deg (moon at  33.0deg phase=0.23 elev= -9.0 )
AL_20161004_200633694_000000_34894401    39 stars filter C [25499.8s - 25679.8s] expo=180s elev=21.4deg humid= 79% sunelev=-31.8deg (moon at  33.0deg phase=0.23 elev=-10.0 )
AL_20161004_202437023_000000_34894501    34 stars filter C [26583.1s - 26763.1s] expo=180s elev=18.3deg humid= 80% sunelev=-34.7deg (moon at  33.0deg phase=0.23 elev=-13.0 )
AL_20161004_202747601_000000_34894501    26 stars filter C [26773.6s - 26953.6s] expo=180s elev=17.8deg humid= 81% sunelev=-35.2deg (moon at  33.0deg phase=0.23 elev=-13.0 )
AL_20161004_203058976_000000_34894501    40 stars filter C [26965.1s - 27145.1s] expo=180s elev=17.3deg humid= 80% sunelev=-35.6deg (moon at  33.0deg phase=0.23 elev=-14.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457666.04061 2016-10-04T12:58:28.704
Decoded useful notice informations.
RA(J2000.0) : 263.1524 17h32m36s5
DEC(J2000.0) : -0.9506 -00d57m02s16
Error radius : 1.1 arcsec
Error box : x=84:85 y=40:41 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=22.8123997569 lat=17.0026302551
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.247
Assuming Rv=3.1: Av=0.818 Ar=0.659 Ai=0.478 Extinction map E(B-V) from Schlegel:

Field of View is about 65 arcmin (north is NOT up !)

Bibliography (Last GCNC circulars and status of satellites)

GCN infos of this burst
GCN notice of this burst
Sloan Digital Sky Survey Observations of Gamma Ray Burst Fields
GCN info bursts
Gamma-ray burst real-time sky map
ROTSE last GRB images

Example of a GCNC email for this burst
GRB 161004: TAROT Calern observatory optical observations
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 161004 detected by SWIFT
(trigger 715084) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 4.94h after the GRB trigger.
The elevation of the field decreased from
39 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-10-04T12:58:28.704

The first image is trailed with a duration of 180.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+17777.6s to t0+17957.6s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+17968.8s to t0+18148.8s : R > 16.2

We co-added a series of exposures:
t0+17968.8s to t0+20897.1s : R > 17.7
---- YES
We detect a new fading source in the error box given by SWIFT
We detected the candidate couterpart mentioned by XXX et al. (GCNC XXXX)
at the following position (+/- 3 arcsec):

RA(J2000.0) = XXh XXm XX.XXs
DEC(J2000.0) +XXd XX' XX.X"

OT was R~XX.X at 4.94h after GRB.

Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.

N.B. Galactic coordinates are lon= 22.8124 lat=+17.0026
and the galactic extinction in R band is 0.7 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.